C3.1 Improved efficiency of use
The key to improved efficiency lies in setting up mechanisms for changing people’s attitudes and behaviour towards water use. Such mechanisms include:
Regulations and by-laws can be used to set standards for water consumption (C6). These may explicitly aim to prevent “waste, misuse or undue consumption” in public water supply. Bylaws and regulations can also cover standards and use of water appliances, e.g. water fittings and appliances, which are required to achieve minimum standards of water efficiency. Such tools can change behaviour and stimulate the introduction of lower water consumption technologies.
Technologies for reducing consumption vary by application and context – e.g. drip irrigation to replace flood irrigation, and retrofitting and pressure reduction. In agriculture, crop patterns are modified to reduce water use (France, Tunisia). Shifting the management of irrigation water at field level to farmer groups (with governments retaining the responsibility for bulk supply) creates the possibility of more efficient use and can make volumetric charging possible.
Use of indicators such as product labelling and access to technical support information is important (C4.3) as are water campaigns, awareness raising, and performance indicators (C1.4). A useful technique is the water audit, which, by using simple procedures, can easily identify gross inefficiencies in water use in, for example, industrial plants.
Improved efficiency of use is achievable in almost all situations, but the specific tools vary widely according to circumstances. For example, tariffs for water use are only effective if linked to volumetric use, with means of measurement such as meters or discrete volume measures. Efficiency is also ensured by providing a service that is used. Stakeholder dialogue helps tailor water management to meet the needs of society without waste. Ignoring the needs of special groups, such as women in the case of domestic water supply, or subsistence farmers in the case of irrigation, means that both capital and operational investments are often wasted.
(See also B1.7 (role of the private sector), B2.3 (regulatory and enforcement agencies), C7.1 (pricing of water and water services), C6.3 (regulations for water services).)